http://blogs.washplus.org/drinkingwaterupdates/2012/04/using-limes-and-synthetic-psoralens-to-enhance-solar-disinfection-of-water-sodis/ from the WASHplus Project Tue, 22 Sep 2015 12:34:42 +0000 hourly 1 http://wordpress.org/?v=3.1.4